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Pityriasis Lichenoides et Varioliformis Acuta (Mucha-Habermann)

definition

Pityriasis lichenoides is an uncommon inflammatory disease of unknown aetiology divided into an acute and a chronic form. Mucha-Habermann disease corresponds to the acute form and is characterised by recurrent erythematous, round papules, hemorrhage, blisters and varioliform vesiculopustules. The distribution of the lesions is variable, the scalp, hands and feet being seldom involved. There may be just a few episodes and complete resolution within 6-8 week, but lesions may also recur over many months or even years. The chronic form of the disease is called pityriasis lichenoides chronica.